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CN-224217321-U - Cooling device of main transformer

CN224217321UCN 224217321 UCN224217321 UCN 224217321UCN-224217321-U

Abstract

The utility model provides a cooling device of a main transformer, which relates to the field of cooling equipment for the main transformer and comprises a transformer shell, wherein the transformer shell is used for protecting a transformer core, insulating oil is added into the transformer shell, a cooling assembly comprises a cooling fin and a first fan which are used for cooling the transformer shell, a frame fixed on one side of the transformer shell, a coiled pipe, a fin and a second fan which are used for cooling the insulating oil, and a circulating assembly comprises a circulating pump and a return pipe which is communicated with the transformer shell and a liquid inlet end of the circulating pump.

Inventors

  • ZHU WEI

Assignees

  • 中核汇能江苏能源有限公司

Dates

Publication Date
20260508
Application Date
20250604

Claims (7)

  1. 1. A cooling device of a main transformer is characterized by comprising, The transformer comprises a transformer shell (100), wherein the transformer shell (100) is used for protecting a transformer core, and insulating oil is added into the transformer shell; A cooling assembly (200) including a heat sink (210) and a first fan (220) for heat dissipation of the transformer housing (100), a frame (230) fixed to one side of the transformer housing (100), a serpentine tube (240) for cooling insulating oil, fins (250) and a second fan (260), and a support plate (270) for supporting the frame (230); The circulating assembly (300) comprises a circulating pump (310), a return pipe (320) communicated with the transformer shell (100) and the liquid inlet end of the circulating pump (310), a guide pipe (330) communicated with the liquid outlet end of the circulating pump (310) and the inlet of the coiled pipe (240), a circulating pipe (340) communicated with the outlet of the coiled pipe (240), an oil inlet pipe (350) communicated with the oil inlet of the transformer shell (100), a first electromagnetic valve (360) arranged on the surface of the guide pipe (330), and a second electromagnetic valve (370) arranged on the surface of the circulating pipe (340), wherein the other end of the circulating pipe (340) is communicated with the oil inlet pipe (350); The control assembly (500) comprises a control box (510) fixed with the transformer shell (100), a second liquid level sensor (520) and a thermocouple (530) fixed on the surface of the transformer shell (100), and a PLC (programmable logic controller) (540), a relay (550), a frequency converter (560) and a display (570) fixed in the inner cavity of the control box (510); The output end of second level sensor (520) and thermocouple (530) are all connected with the input of PLC controller (540), the output of PLC controller (540) is connected with the input of relay (550), converter (560) and display (570) respectively, the output of relay (550) is connected with the input of first solenoid valve (360) and second solenoid valve (370) respectively, the output of converter (560) is connected with the input of first fan (220), second fan (260) and circulating pump (310) respectively.
  2. 2. The cooling device of main transformer of claim 1, wherein the fluid replacement assembly (400) comprises an oil storage tank (410), a fluid replacement pipe (420) communicated with the transformer housing (100) and the oil storage tank (410), a third electromagnetic valve (430) installed on the surface of the fluid replacement pipe (420), a first liquid level sensor (440) fixed on one side of the oil storage tank (410), and a fuel tank cover (450) installed on the top of the oil storage tank (410), wherein the output end of the first liquid level sensor (440) is connected with the input end of a PLC (540), and the output end of the PLC (540) is connected with the input end of the third electromagnetic valve (430).
  3. 3. The cooling device of main transformer according to claim 1, wherein said support plate (270) is fixedly connected to the transformer housing (100), said frame (230) is fixedly connected to the support plate (270) by bolts, and said serpentine tube (240) is fixed to the inner cavity of the frame (230).
  4. 4. The cooling device of main transformer according to claim 1, wherein said fins (250) are fixed to the surface of a serpentine tube (240), said heat sink (210) is fixedly connected to the transformer housing (100), said first fan (220) is fixed to the surface of the heat sink (210), and said second fan (260) is fixed to the back surface of the frame (230).
  5. 5. The cooling device of the main transformer of claim 2, wherein the oil storage tank (410) is fixedly connected with the transformer housing (100), two first liquid level sensors (440) are arranged on the upper end and the lower end of the surface of the oil storage tank (410), and the detection ends of the first liquid level sensors (440) penetrate through the inner cavity of the oil storage tank (410).
  6. 6. The cooling device of the main transformer of claim 1, wherein two second liquid level sensors (520) are arranged, detection ends of the second liquid level sensors extend to an inner cavity of the transformer housing (100), the two second liquid level sensors (520) are respectively used for monitoring the highest liquid level and the early warning liquid level in the inner cavity of the transformer housing (100), and the detection ends of the thermocouples (530) penetrate to the inner cavity of the transformer housing (100).
  7. 7. The cooling device of the main transformer of claim 1, wherein the control assembly (500) is installed at one side of the transformer housing (100), the circulation assembly (300) is installed at the other side of the transformer housing (100), and the oil inlet pipe (350) is fixed at the top of the transformer housing (100).

Description

Cooling device of main transformer Technical Field The utility model belongs to the field of cooling equipment for main transformers, and particularly relates to a cooling device for a main transformer. Background The main transformer is core equipment for voltage conversion and electric energy transmission in an electric power system, and mainly comprises a shell, an iron core, a coil, a protection device and the like, wherein the iron core and the coil are soaked in the shell filled with insulating oil, as shown in the following figure 7, the main transformer is widely applied to the fields of power plants, substations, industries, businesses and the like, and generates a large amount of heat in the operation process of the main transformer, so that the main transformer needs to be cooled and radiated to ensure the normal operation and prolong the service life of the main transformer; the main transformer heat dissipation mode mainly adopts the following points: Natural cooling, namely radiating through the radiation of the oil tank wall and the radiator and naturally convection radiating of air, and is suitable for small-capacity oil immersed transformers and dry transformers; air cooling, namely adding a fan on the basis of natural cooling to accelerate air flow and improve heat dissipation efficiency, and is suitable for medium-sized oil immersed transformers and dry transformers; Forced oil circulation air cooling, namely, sending oil into a cooler through an oil pump for cooling and then recirculating the oil back to an oil tank, and being suitable for a large-capacity oil immersed main transformer; Forced oil circulation water cooling, which is similar to forced oil circulation air cooling, but uses water as a cooling medium, is suitable for large-capacity transformers, in particular to step-up transformers of hydroelectric power plants; Forced guiding oil circulation air cooling and water cooling, namely, the cooling efficiency is improved through guiding oil circulation, and the method is suitable for transformers with higher capacity; However, in actual use, no matter which mode is adopted to cool and dissipate heat of the main transformer, the cooling mode is a fixed mode, so that the cooling device cannot be cooled and adjusted according to actual temperature change, and energy consumption is wasted. In summary, the present utility model provides a cooling device for a main transformer to solve the above problems. Disclosure of utility model In order to solve the technical problems, the utility model provides the following technical scheme: The utility model provides a heat sink of main transformer, includes the transformer casing, the transformer casing is used for transformer core protection, and inside interpolation insulating oil, cooling module, including be used for transformer casing radiating fin and first fan, be fixed in the frame of transformer casing one side, be used for insulating oil cooling's coiled pipe, fin and second fan, and be used for the backup pad that the frame supported, circulating module, including the circulating pump, with the back flow of transformer casing and circulating pump feed end intercommunication, with circulating pump feed end and coiled pipe import intercommunication the honeycomb duct, with the circulating pipe of coiled pipe export intercommunication, with the inlet tube of transformer casing oil inlet intercommunication, install in first solenoid valve on honeycomb duct surface, and install in the second solenoid valve on circulating pipe surface, and the other end and the inlet tube intercommunication, control module including with the control box that the transformer casing is fixed, be fixed in second liquid level sensor and thermocouple on transformer casing surface, and be fixed in the controller in control box inner chamber, converter, frequency converter, liquid level sensor and the second solenoid valve, the output of frequency converter and the second solenoid valve, the input of frequency converter and the input of PLC respectively with the input of second solenoid valve, the output of frequency converter and second solenoid valve, input of frequency converter and output of frequency converter, input of PLC respectively. Further, in the utility model, the fluid infusion assembly comprises an oil storage tank, a fluid infusion pipe communicated with the transformer shell and the oil storage tank, a third electromagnetic valve arranged on the surface of the fluid infusion pipe, a first liquid level sensor fixed on one side of the oil storage tank, and an oil tank cover arranged on the top of the oil storage tank, wherein the output end of the first liquid level sensor is connected with the input end of a PLC (programmable logic controller), and the output end of the PLC is connected with the input end of the third electromagnetic valve. Further, in the utility model, the supporting plate is fixedly connected with the transformer shell, the fr